[release-10.2.1] Acceptance test changes from stable10 to 20190701

[phil-davis]

Description

Backports of these PRs from stable10

[stable10] Remove unused use from acceptance tests #35629
[stable10] Add tests for app management for apps-external path #35631
[stable10] user create and delete scenario case not sensitive #35632
[stable10] test user remove from group #35639
[stable10] sharing with user and groups with different case username and groupname #35651
[stable10] Make consistent file-folder-entry test steps #35657
[stable10] Load PHPunit app tests in alphabetical order #35669
[stable10] Fix drone webUIMasterKeyType so it runs the tests #35659
[stable10] Add Better error handling to batch user create function in acceptance tests #35674
[stable10] api share with users and group case not sensitive #35675
[stable10] clone testing app into apps external #35679
[stable10] clone testing app into apps external #35679
[stable10] Enhance createShare.feature test scenarios #35686
[stable10] Adjust createShare scenario to ensure skeleton file welcome.txt is there #35691
[stable10] only look for unit tests in the primary apps dir #35700
[stable10] Test regression with public link not created when default expiration date set and enforced #35703

Motivation and Context

Have the latest test code in the release-10.2.1 branch.

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[patrickjahns]

LGTM